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<?php
/**
* @package dompdf
* @link https://github.com/dompdf/dompdf
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
namespace Dompdf;
use Dompdf\Css\Style;
use FontLib\Font;
/**
* The font metrics class
*
* This class provides information about fonts and text. It can resolve
* font names into actual installed font files, as well as determine the
* size of text in a particular font and size.
*
* @static
* @package dompdf
*/
class FontMetrics
{
/**
* Name of the user font families lookup cache file
*
* This file must be readable and writable by the executing (webserver)
* process in order to cache user installed font information.
*/
const USER_FONTS_FILE = "installed-fonts.json";
/**
* Underlying {@link Canvas} object to perform text size calculations
*
* @var Canvas
*/
protected $canvas;
/**
* Array of bundled font family names to variants
*
* @var array
*/
protected $bundledFonts = [];
/**
* Array of user defined font family names to variants
*
* @var array
*/
protected $userFonts = [];
/**
* combined list of all font families with absolute paths
*
* @var array
*/
protected $fontFamilies;
/**
* @var Options
*/
private $options;
/**
* Class initialization
*/
public function __construct(Canvas $canvas, Options $options)
{
$this->setCanvas($canvas);
$this->setOptions($options);
$this->loadFontFamilies();
}
/**
* @deprecated
*/
public function save_font_families()
{
$this->saveFontFamilies();
}
/**
* Saves the stored font family cache
*
* The name and location of the cache file are determined by {@link
* FontMetrics::USER_FONTS_FILE}. This file should be writable by the
* webserver process.
*
* @see FontMetrics::loadFontFamilies()
*/
public function saveFontFamilies()
{
file_put_contents($this->getUserFontsFilePath(), json_encode($this->userFonts, JSON_PRETTY_PRINT));
}
/**
* @deprecated
*/
public function load_font_families()
{
$this->loadFontFamilies();
}
/**
* Loads the stored font family cache
*
* @see FontMetrics::saveFontFamilies()
*/
public function loadFontFamilies()
{
$file = $this->options->getRootDir() . "/lib/fonts/installed-fonts.dist.json";
$this->bundledFonts = json_decode(file_get_contents($file), true);
if (is_readable($this->getUserFontsFilePath())) {
$this->userFonts = json_decode(file_get_contents($this->getUserFontsFilePath()), true);
} else {
$this->loadFontFamiliesLegacy();
}
}
private function loadFontFamiliesLegacy()
{
$legacyCacheFile = $this->options->getFontDir() . '/dompdf_font_family_cache.php';
if (is_readable($legacyCacheFile)) {
$fontDir = $this->options->getFontDir();
$rootDir = $this->options->getRootDir();
$cacheDataClosure = require $legacyCacheFile;
$cacheData = is_array($cacheDataClosure) ? $cacheDataClosure : $cacheDataClosure($fontDir, $rootDir);
if (is_array($cacheData)) {
foreach ($cacheData as $family => $variants) {
if (!isset($this->bundledFonts[$family]) && is_array($variants)) {
foreach ($variants as $variant => $variantPath) {
$variantName = basename($variantPath);
$variantDir = dirname($variantPath);
if ($variantDir == $fontDir) {
$this->userFonts[$family][$variant] = $variantName;
} else {
$this->userFonts[$family][$variant] = $variantPath;
}
}
}
}
$this->saveFontFamilies();
}
}
}
/**
* @param array $style
* @param string $remote_file
* @param resource $context
* @return bool
* @deprecated
*/
public function register_font($style, $remote_file, $context = null)
{
return $this->registerFont($style, $remote_file);
}
/**
* @param array $style
* @param string $remoteFile
* @param resource $context
* @return bool
*/
public function registerFont($style, $remoteFile, $context = null)
{
$fontname = mb_strtolower($style["family"], "UTF-8");
$families = $this->getFontFamilies();
$entry = [];
if (isset($families[$fontname])) {
$entry = $families[$fontname];
}
$styleString = $this->getType("{$style['weight']} {$style['style']}");
$remoteHash = md5($remoteFile);
$prefix = $fontname . "_" . $styleString;
$prefix = trim($prefix, "-");
if (function_exists('iconv')) {
$prefix = @iconv('utf-8', 'us-ascii//TRANSLIT', $prefix);
}
$prefix_encoding = mb_detect_encoding($prefix, mb_detect_order(), true);
$substchar = mb_substitute_character();
mb_substitute_character(0x005F);
$prefix = mb_convert_encoding($prefix, "ISO-8859-1", $prefix_encoding);
mb_substitute_character($substchar);
$prefix = preg_replace("[\W]", "_", $prefix);
$prefix = preg_replace("/[^-_\w]+/", "", $prefix);
$localFile = $prefix . "_" . $remoteHash;
$localFilePath = $this->getOptions()->getFontDir() . "/" . $localFile;
if (isset($entry[$styleString]) && $localFilePath == $entry[$styleString]) {
return true;
}
$entry[$styleString] = $localFile;
// Download the remote file
[$protocol] = Helpers::explode_url($remoteFile);
$allowed_protocols = $this->options->getAllowedProtocols();
if (!array_key_exists($protocol, $allowed_protocols)) {
Helpers::record_warnings(E_USER_WARNING, "Permission denied on $remoteFile. The communication protocol is not supported.", __FILE__, __LINE__);
return false;
}
foreach ($allowed_protocols[$protocol]["rules"] as $rule) {
[$result, $message] = $rule($remoteFile);
if ($result !== true) {
Helpers::record_warnings(E_USER_WARNING, "Error loading $remoteFile: $message", __FILE__, __LINE__);
return false;
}
}
[$remoteFileContent, $http_response_header] = @Helpers::getFileContent($remoteFile, $context);
if ($remoteFileContent === null) {
return false;
}
$localTempFile = @tempnam($this->options->get("tempDir"), "dompdf-font-");
file_put_contents($localTempFile, $remoteFileContent);
$font = Font::load($localTempFile);
if (!$font) {
unlink($localTempFile);
return false;
}
$font->parse();
$font->saveAdobeFontMetrics("$localFilePath.ufm");
$font->close();
unlink($localTempFile);
if ( !file_exists("$localFilePath.ufm") ) {
return false;
}
$fontExtension = ".ttf";
switch ($font->getFontType()) {
case "TrueType":
default:
$fontExtension = ".ttf";
break;
}
// Save the changes
file_put_contents($localFilePath.$fontExtension, $remoteFileContent);
if ( !file_exists($localFilePath.$fontExtension) ) {
unlink("$localFilePath.ufm");
return false;
}
$this->setFontFamily($fontname, $entry);
return true;
}
/**
* @param $text
* @param $font
* @param $size
* @param float $word_spacing
* @param float $char_spacing
* @return float
* @deprecated
*/
public function get_text_width($text, $font, $size, $word_spacing = 0.0, $char_spacing = 0.0)
{
//return self::$_pdf->get_text_width($text, $font, $size, $word_spacing, $char_spacing);
return $this->getTextWidth($text, $font, $size, $word_spacing, $char_spacing);
}
/**
* Calculates text size, in points
*
* @param string $text The text to be sized
* @param string $font The font file to use
* @param float $size The font size, in points
* @param float $wordSpacing Word spacing, if any
* @param float $charSpacing Char spacing, if any
*
* @return float
*/
public function getTextWidth(string $text, $font, float $size, float $wordSpacing = 0.0, float $charSpacing = 0.0): float
{
// @todo Make sure this cache is efficient before enabling it
static $cache = [];
if ($text === "") {
return 0;
}
// Don't cache long strings
$useCache = !isset($text[50]); // Faster than strlen
// Text-size calculations depend on the canvas used. Make sure to not
// return wrong values when switching canvas backends
$canvasClass = get_class($this->canvas);
$key = "$canvasClass/$font/$size/$wordSpacing/$charSpacing";
if ($useCache && isset($cache[$key][$text])) {
return $cache[$key][$text];
}
$width = $this->canvas->get_text_width($text, $font, $size, $wordSpacing, $charSpacing);
if ($useCache) {
$cache[$key][$text] = $width;
}
return $width;
}
/**
* Maps substrings of text against the provided font list. This is achieved by
* parsing each character of the string against the supported glyphs for each
* font. Fonts preference is based on the order of the font list.
*
* Returns an array containing substring information that indicates the
* matched font (if any), start index, substring length, and (optionally)
* the actual text of the substring.
*
* @param string $text The text to map
* @param array $fontFamilies List of font families to map against
* @param string $subtype The font subtype (italic, bold, etc.)
* @param int $count The number of matches to return
* @param bool $returnSubstring Should the actual matched text be returned
* @return array
*/
public function mapTextToFonts(string $text, array $fontFamilies, string $subtype = "normal", int $count = -1, bool $returnSubstring = false): array
{
$char_mapping = [];
$fonts = [];
foreach ($fontFamilies as $family) {
$font = $this->getFont($family, $subtype);
if ($font !== null) {
$fonts[] = $font;
}
}
if (function_exists("mb_str_split")) {
$char_array = mb_str_split($text, 1, "UTF-8");
} else {
$char_array = preg_split("//u", $text, -1, PREG_SPLIT_NO_EMPTY);
}
$start_index = 0;
$char_index = -1;
while (isset($char_array[++$char_index])) {
$char = $char_array[$char_index];
if (preg_match('/[\x00-\x1F\x7F]/u', $char)) {
//non-printable, moving on
continue;
}
$mapped_font = null;
foreach ($fonts as $font) {
if ($this->canvas->font_supports_char($font, $char)) {
$mapped_font = $font;
break;
}
}
if (!isset($char_mapping[$start_index])) {
$char_mapping[$start_index] = ["font" => $mapped_font, "length" => 0, "text" => null];
}
if ($mapped_font !== $char_mapping[$start_index]["font"]) {
$char_mapping[$start_index]["length"] = $char_index - $start_index;
if ($count > 0 && count($char_mapping) === $count) {
break;
}
$start_index = $char_index;
$char_mapping[$start_index] = ["font" => $mapped_font, "length" => 0, "text" => null];
}
}
if ($returnSubstring) {
// build the string for each mapping
foreach ($char_mapping as $start_index => &$info) {
$info["text"] = mb_substr($text, $start_index, $info["length"], "UTF-8");
}
}
return $char_mapping;
}
/**
* @param $font
* @param $size
* @return float
* @deprecated
*/
public function get_font_height($font, $size)
{
return $this->getFontHeight($font, $size);
}
/**
* Calculates font height, in points
*
* @param string $font The font file to use
* @param float $size The font size, in points
*
* @return float
*/
public function getFontHeight($font, float $size): float
{
return $this->canvas->get_font_height($font, $size);
}
/**
* Calculates font baseline, in points
*
* @param string $font The font file to use
* @param float $size The font size, in points
*
* @return float
*/
public function getFontBaseline($font, float $size): float
{
return $this->canvas->get_font_baseline($font, $size);
}
/**
* @param $family_raw
* @param string $subtype_raw
* @return string
* @deprecated
*/
public function get_font($family_raw, $subtype_raw = "normal")
{
return $this->getFont($family_raw, $subtype_raw);
}
/**
* Resolves a font family & subtype into an actual font file
* Subtype can be one of 'normal', 'bold', 'italic' or 'bold_italic'. If
* the particular font family has no suitable font file, the default font
* ({@link Options::defaultFont}) is used. The font file returned
* is the absolute pathname to the font file on the system.
*
* @param string|null $familyRaw
* @param string $subtypeRaw
*
* @return string|null
*/
public function getFont($familyRaw, $subtypeRaw = "normal")
{
static $cache = [];
if (!$familyRaw) {
$familyRaw = $familyRaw === null ? 0 : $this->options->getDefaultFont();
}
if (!$subtypeRaw) {
$subtypeRaw = "normal";
}
if (isset($cache[$familyRaw][$subtypeRaw])) {
return $cache[$familyRaw][$subtypeRaw];
}
/* Allow calling for various fonts in search path. Therefore not immediately
* return replacement on non match.
* Only when called with NULL try replacement.
* When this is also missing there is really trouble.
* If only the subtype fails, nevertheless return failure.
* Only on checking the fallback font, check various subtypes on same font.
*/
$subtype = strtolower($subtypeRaw);
$families = $this->getFontFamilies();
if ($familyRaw) {
$family = str_replace(["'", '"'], "", strtolower($familyRaw));
if (isset($families[$family][$subtype])) {
return $cache[$familyRaw][$subtypeRaw] = $families[$family][$subtype];
}
return null;
}
$fallback_families = [strtolower($this->options->getDefaultFont()), "serif"];
foreach ($fallback_families as $family) {
if (isset($families[$family][$subtype])) {
return $cache[$familyRaw][$subtypeRaw] = $families[$family][$subtype];
}
if (!isset($families[$family])) {
continue;
}
$family = $families[$family];
foreach ($family as $sub => $font) {
if (strpos($subtype, $sub) !== false) {
return $cache[$familyRaw][$subtypeRaw] = $font;
}
}
if ($subtype !== "normal") {
foreach ($family as $sub => $font) {
if ($sub !== "normal") {
return $cache[$familyRaw][$subtypeRaw] = $font;
}
}
}
$subtype = "normal";
if (isset($family[$subtype])) {
return $cache[$familyRaw][$subtypeRaw] = $family[$subtype];
}
}
return null;
}
/**
* @param $family
* @return null|string
* @deprecated
*/
public function get_family($family)
{
return $this->getFamily($family);
}
/**
* @param string $family
* @return null|string
*/
public function getFamily($family)
{
$family = str_replace(["'", '"'], "", mb_strtolower($family, "UTF-8"));
$families = $this->getFontFamilies();
if (isset($families[$family])) {
return $families[$family];
}
return null;
}
/**
* @param $type
* @return string
* @deprecated
*/
public function get_type($type)
{
return $this->getType($type);
}
/**
* @param string $type
* @return string
*/
public function getType($type)
{
if (preg_match('/bold/i', $type)) {
$weight = 700;
} elseif (preg_match('/([1-9]00)/', $type, $match)) {
$weight = (int)$match[0];
} else {
$weight = 400;
}
$weight = $weight === 400 ? 'normal' : $weight;
$weight = $weight === 700 ? 'bold' : $weight;
$style = preg_match('/italic|oblique/i', $type) ? 'italic' : null;
if ($weight === 'normal' && $style !== null) {
return $style;
}
return $style === null
? $weight
: $weight.'_'.$style;
}
/**
* @return array
* @deprecated
*/
public function get_font_families()
{
return $this->getFontFamilies();
}
/**
* Returns the current font lookup table
*
* @return array
*/
public function getFontFamilies()
{
if (!isset($this->fontFamilies)) {
$this->setFontFamilies();
}
return $this->fontFamilies;
}
/**
* Convert loaded fonts to font lookup table
*
* @return array
*/
public function setFontFamilies()
{
$fontFamilies = [];
if (isset($this->bundledFonts) && is_array($this->bundledFonts)) {
foreach ($this->bundledFonts as $family => $variants) {
if (!isset($fontFamilies[$family])) {
$fontFamilies[$family] = array_map(function ($variant) {
return $this->getOptions()->getRootDir() . '/lib/fonts/' . $variant;
}, $variants);
}
}
}
if (isset($this->userFonts) && is_array($this->userFonts)) {
foreach ($this->userFonts as $family => $variants) {
$fontFamilies[$family] = array_map(function ($variant) {
$variantName = basename($variant);
if ($variantName === $variant) {
return $this->getOptions()->getFontDir() . '/' . $variant;
}
return $variant;
}, $variants);
}
}
$this->fontFamilies = $fontFamilies;
}
/**
* @param string $fontname
* @param mixed $entry
* @deprecated
*/
public function set_font_family($fontname, $entry)
{
$this->setFontFamily($fontname, $entry);
}
/**
* @param string $fontname
* @param mixed $entry
*/
public function setFontFamily($fontname, $entry)
{
$this->userFonts[mb_strtolower($fontname, "UTF-8")] = $entry;
$this->saveFontFamilies();
unset($this->fontFamilies);
}
/**
* @return string
*/
public function getUserFontsFilePath()
{
return $this->options->getFontDir() . '/' . self::USER_FONTS_FILE;
}
/**
* @param Options $options
* @return $this
*/
public function setOptions(Options $options)
{
$this->options = $options;
unset($this->fontFamilies);
return $this;
}
/**
* @return Options
*/
public function getOptions()
{
return $this->options;
}
/**
* @param Canvas $canvas
* @return $this
*/
public function setCanvas(Canvas $canvas)
{
$this->canvas = $canvas;
return $this;
}
/**
* @return Canvas
*/
public function getCanvas()
{
return $this->canvas;
}
}